Category Archives: Contagious Diseases

Knowing the Risks

by Elizabeth Xu

As a dog owner who likely thinks of your dog as a member of your family, you never want them to get ill. After all, our pets can’t exactly tell us what’s wrong. Like humans, dogs can get plenty of diseases—especially from other dogs.

Medicine is always advancing, for both human and animals. And while that means that many of these diseases aren’t as prevalent as they once were, you should still be aware of any disease your dog may be exposed to, whether at the dog park, daycare kennel, or elsewhere.

Canine Parvovirus

Parvovirus is one of the first things puppies get vaccinated for—and with good reason. Puppies with parvo can get severe diarrhea, vomiting, and regurgitation, which can lead to dehydration and death, said Dr. Colin Parrish, professor at the Baker Institute for Animal Health at Cornell University.

“Vaccination for parvovirus is highly effective,” he says. “Basically we recommend that everyone get parvovirus vaccines for their puppies. You’d be sort of insane not to vaccinate your puppy against parvovirus.”

The virus is spread orally, through fecal/oral transmission, Parrish said. If a dog becomes infected, it’s important to keep them hydrated and make sure they’re getting nutrients.

The American Society for the Prevention of Cruelty to Animals (ASPCA) notes that parvo is highly contagious and suggests a thorough cleaning of toys, food and water bowls, and other surfaces with a bleach and water solution if a dog with parvo has been in contact with them.

Canine Influenza

Dog flu is spread very much like the human flu, through coughing and sneezing, Parrish said, noting that recovery is also similar to humans in that dogs should be kept warm and comfortable while they recover naturally.

“The canine flu is mostly transmitted these days in animal shelters, so it’s not spreading widely among dogs in general,” he said. He also said there was a large outbreak in a Chicago kennel where hundreds of dogs were infected within days. Still, he says, dogs that don’t frequent places like day care and boarding don’t necessarily need the vaccine—though many of those places now require it.

“Before canine influenza, most of the contagious stuff for dogs was stuff we were vaccinating for,” said Dr. Duffy Jones at Peachtree Hills Animal Hospital in Georgia. “We had known about these diseases, but with the vaccine everything was pretty well controlled.”

Canine Distemper

Distemper is deadly and used to be seen much more decades ago, before it became the first big vaccine for dogs, Jones said. The disease is spread by bodily secretions and causes three issues: gastrointestinal upset, upper respiratory issues, and then it affects the neurologic system, after which dogs could have seizures and die, he said.

Luckily the vaccine is safe and effective, and Jones says he doesn’t see distemper very often these days. “For the most part we’ve done a good job of controlling a very devastating disease.”

Leptospirosis

Leptospirosis is often spread through wildlife, so veterinarians used to think of it as a more rural disease, Jones said. That’s not the case anymore, though it’s hard to tell where exactly a dog might get it since the disease is transmitted through urine, he said.

When dog diseases can affect humans, they’re extra worrisome for society, Jones said, noting that it can cause liver and kidney failure in both humans and animals. In fact, it could even lead to infected humans needing a kidney transplant, he said.

The American Veterinary Medical Association (AMVA) says that the signs of leptospirosis vary from dog to dog, but could include fever, vomiting, thirst, jaundice, and either frequent urination or lack of urination. It also notes that, if treated early, dogs can recover. However, Dr. Richard Baumgartner of Atlantic Veterinary Hospital in New Jersey notes that recovery could take months, and some dogs might never fully recover.

Coronavirus

Like canine influenza, coronavirus is spread from dog to dog through coughing and sneezing, according to the AMVA. Jones said it can be hard to diagnose.

“[People say] corona is a virus looking for a vaccine, meaning there’s a lot of corona out there but it may not clinically do very much,” he said, adding that it can cause vomiting and diarrhea, but some veterinarians have stopped vaccinating for it in an effort to reduce the number of vaccines a dog receives overall.

Canine Herpesvirus (CHV)

Dogs of any age can be affected by CHV, but the highest mortality rate is in puppies, says Dr. Gerlinde Van de Walle, professor at the Baker Institute for Animal Health at Cornell University. Older dogs might have a mild fever or respiratory problems, but otherwise CHV might be unnoticed in them unless they have compromised health for other reasons, she says. However, it’s important to note that this virus can establish latency, thus dogs can have it for life, she says.

Though treatment is available, veterinarians have mixed opinions on whether it should be used because puppies with CHV so commonly die, Van de Walle says. While there’s a CHV vaccine in the United Kingdom, it’s not available in the United States. However, there are a few things you can do to protect puppies from CHV.

“What you for sure should do is try to prevent infection of puppies by keeping newborn puppies warm,” Van de Walle says, noting that puppies have poor temperature regulation and CHV thrives in lower temperatures. “That’s why these puppies are so susceptible for infection and that’s why it’s leads to such a devastating outcome.”

Ringworm

Named for the pattern the disease makes and not because it’s an actual worm, ringworm is a fungus that affects a dog’s skin. While it is contagious, isn’t necessarily seen in many dogs these days.

“Most of the time a healthy dog isn’t going to get ringworm,” Baumgartner said, noting that it’s more often seen in puppies and older dogs who already have other health issues. Jones said it’s most often seen in shelter settings.

Rabies

Rabies is well-known, but Jones said that the vaccination’s been so good that people let their guard down about this deadly disease.

“I think because the vaccine has been so good, a lot of humans aren’t as worried about rabies,” he said. “What they don’t realize is that rabies is 100 percent fatal in people. We really, really have to be careful about that and make sure we’re keeping the animals up-to-date for rabies.”

The ASPCA says the disease spreads through a bite from an animal with the disease, and dogs who are in contact with wild animals are at highest risk. They also note that if a dog bites someone and there’s no proof that the dog has been vaccinated against rabies, a period of quarantine or even euthanasia could occur.

In most states, there is a legal requirement that all owners get their dogs vaccinated for rabies. The duration of the vaccine required varies from state to state.

Not only will the vaccine keep your dog safe, it will protect you as well, Jones said. “The rabies vaccine is really to protect people. We’re vaccinating the dogs and cats as a buffer between wildlife and people.”